CN103661357A - Control system and method for continuously variable transmission - Google Patents

Control system and method for continuously variable transmission Download PDF

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Publication number
CN103661357A
CN103661357A CN201310415016.4A CN201310415016A CN103661357A CN 103661357 A CN103661357 A CN 103661357A CN 201310415016 A CN201310415016 A CN 201310415016A CN 103661357 A CN103661357 A CN 103661357A
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China
Prior art keywords
vsr
speed
motor
actual
hope
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Granted
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CN201310415016.4A
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Chinese (zh)
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CN103661357B (en
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J.X.崔
R.A.韦弗
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GM Global Technology Operations LLC
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GM Global Technology Operations LLC
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
    • F16H61/664—Friction gearings
    • F16H61/6648—Friction gearings controlling of shifting being influenced by a signal derived from the engine and the main coupling
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H63/00—Control outputs from the control unit to change-speed- or reversing-gearings for conveying rotary motion or to other devices than the final output mechanism
    • F16H63/02—Final output mechanisms therefor; Actuating means for the final output mechanisms
    • F16H63/04—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism
    • F16H63/06—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism the final output mechanism having an indefinite number of positions
    • F16H63/065—Final output mechanisms therefor; Actuating means for the final output mechanisms a single final output mechanism being moved by a single final actuating mechanism the final output mechanism having an indefinite number of positions hydraulic actuating means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K23/00—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for
    • B60K23/02—Arrangement or mounting of control devices for vehicle transmissions, or parts thereof, not otherwise provided for for main transmission clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
    • B60W10/06—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units including control of combustion engines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W10/00—Conjoint control of vehicle sub-units of different type or different function
    • B60W10/10—Conjoint control of vehicle sub-units of different type or different function including control of change-speed gearings
    • B60W10/101—Infinitely variable gearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B67/00—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for
    • F02B67/04—Engines characterised by the arrangement of auxiliary apparatus not being otherwise provided for, e.g. the apparatus having different functions; Driving auxiliary apparatus from engines, not otherwise provided for of mechanically-driven auxiliary apparatus
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
    • F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
    • F16H15/04—Gearings providing a continuous range of gear ratios
    • F16H15/06—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B
    • F16H15/32—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
    • F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
    • F16H15/04—Gearings providing a continuous range of gear ratios
    • F16H15/06—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B
    • F16H15/32—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line
    • F16H15/36—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line with concave friction surface, e.g. a hollow toroid surface
    • F16H15/38—Gearings providing a continuous range of gear ratios in which a member A of uniform effective diameter mounted on a shaft may co-operate with different parts of a member B in which the member B has a curved friction surface formed as a surface of a body of revolution generated by a curve which is neither a circular arc centered on its axis of revolution nor a straight line with concave friction surface, e.g. a hollow toroid surface with two members B having hollow toroid surfaces opposite to each other, the member or members A being adjustably mounted between the surfaces
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
    • F16H15/02—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members without members having orbital motion
    • F16H15/04—Gearings providing a continuous range of gear ratios
    • F16H15/42—Gearings providing a continuous range of gear ratios in which two members co-operate by means of rings or by means of parts of endless flexible members pressed between the first mentioned members
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H15/00—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members
    • F16H15/48—Gearings for conveying rotary motion with variable gear ratio, or for reversing rotary motion, by friction between rotary members with members having orbital motion
    • F16H15/50—Gearings providing a continuous range of gear ratios
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
    • F16H61/662—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members
    • F16H61/66254—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members controlling of shifting being influenced by a signal derived from the engine and the main coupling
    • F16H61/66259—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings with endless flexible members controlling of shifting being influenced by a signal derived from the engine and the main coupling using electrical or electronical sensing or control means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
    • F16H61/664—Friction gearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/66—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for continuously variable gearings
    • F16H61/664—Friction gearings
    • F16H61/6649—Friction gearings characterised by the means for controlling the torque transmitting capability of the gearing
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/70—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for change-speed gearing in group arrangement, i.e. with separate change-speed gear trains arranged in series, e.g. range or overdrive-type gearing arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16H—GEARING
    • F16H61/00—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing
    • F16H61/70—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for change-speed gearing in group arrangement, i.e. with separate change-speed gear trains arranged in series, e.g. range or overdrive-type gearing arrangements
    • F16H61/702—Control functions within control units of change-speed- or reversing-gearings for conveying rotary motion ; Control of exclusively fluid gearing, friction gearing, gearings with endless flexible members or other particular types of gearing specially adapted for change-speed gearing in group arrangement, i.e. with separate change-speed gear trains arranged in series, e.g. range or overdrive-type gearing arrangements using electric or electrohydraulic control means
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B13/00—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion
    • G05B13/02—Adaptive control systems, i.e. systems automatically adjusting themselves to have a performance which is optimum according to some preassigned criterion electric
    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Control Of Transmission Device (AREA)
  • Friction Gearing (AREA)

Abstract

A system and method of controlling a continuously variable transmission with variator speed ratio (VSR) closed-loop feedback is provided. The method includes determining a desired VSR based on at least one of the driver and vehicle inputs, determining a motor position adjustment needed to adjust the position of a roller to achieve the desired VSR, driving the motor based on the determined motor position adjustment needed, sensing a transmission output speed as the motor is being driven, determining an actual VSR as the motor is being driven, and providing closed-loop feedback corresponding to any difference between the actual VSR and the desired VSR and driving the motor to eliminate the difference, thereby achieving the desired VSR with improved quick response time and more accurate control.

Description

Control system and method for continuously variable transmission
Technical field
The present invention relates to a kind of control system and method, it has changer speed ratio closed loop feedback at the continuously variable transmission for vehicle.
Background technology
The dynamic assembly with the explosive motor that is connected to continuous variable or toric transmission is used to provide actv. drive system.In continuous variable or toric transmission (being after this called " CVT "), transmission ratio can be changed to maximum speedup transmitting ratio (over drive ratio) from maximum deceleration transmitting ratio (under drive ratio) in a continuous manner.This allows driving engine in optimum oil consumption region or optimum performance area operation.
CVT comprises traction drive assembly, is generally the form of domain formula unit or half-ring unit.These devices are all delivered to output panel by power or moment of torsion from input disc by tractive force via roller.CVT generally include at least two input discs, two output panels and be arranged on corresponding input disc/output panel between a plurality of rollers.Each assembly of input disc, output panel and roller is changer.Each changer has changer speed ratio (VSR), and it is the ratio between input disc speed and output panel speed.Changer speed ratio is the function of the roller angle of locating.Roller is rotatably supported on lug, and hydraulic coupling is applied on described lug, with by roller corresponding input and output dish between remain on desired location.Be applied to hydraulic pressure foundation dish on lug and the tractive force between roller.Due to the hysteresis in hydraulic efficiency pressure system, the system that changes hydraulic coupling with hydraulic buttery valve or of this sort hydraulic control device may not change rapidly.
Current CVT system can be come with adjusted open loop actuator position with the actuation gear of stepper motor or other types, thereby reaches the roller position of hope, and reaches thus the VSR of hope.Controller instructs stepper motor to move some step pitches to the position calculating, and regulates thus actuator position.The position calculating is corresponding to the VSR of hope.Variation in VSR causes the variation of speed, transmission, thereby vehicle dynamics characteristics changes.Use these vehicle dynamicss to change and chaufeur input, CVT control system was determined the VSR of new hope before stepper motor is moved, regulates actuator position by instructing again.Therefore, such CVT control system has slow response time, and the precision that depends on very much stepper motor location reaches the VSR of hope.Therefore, need such control system, it improves the precision of response time and CVT, and reduces the cost that the required precision due to stepper motor causes.
Summary of the invention
A kind of method of controlling continuously variable transmission by changer speed ratio closed loop feedback is provided.The method is in response to chaufeur and vehicle input, and operate in the system with changer and motor, described changer comprises at least one roller, it is operatively positioned between input disc and output panel, thereby changer speed ratio (VSR) is defined as the ratio of output panel speed and input disc speed, described electrical motor is for adjustment roll wheel location.The method comprises based at least one in the input of chaufeur and vehicle, determines the VSR wishing.Next, the method comprises determines the required motor position adjusting in position that regulates roller, to reach the VSR of hope.The method comprises that the motor position based on required regulates drive motor.Next the method comprises: when electrical motor is just driven sensing change-speed box output speed, when electrical motor is just driven, determine actual VSR and the closed loop feedback corresponding to any difference between actual VSR and the VSR of hope be provided.This motor is actuated to eliminate the difference between VSR actual and that wish, reaches thus the VSR of hope by the fast response time of raising and control more accurately.
Provide for controlling the system of the continuously variable transmission of vehicle, this system response is in chaufeur and vehicle input.This system comprises changer and motor, described changer has at least one roller, it is operatively positioned between input disc and output panel, thereby changer speed ratio (VSR) is defined as the ratio of output panel speed and input disc speed, and described motor is for adjustment roll wheel location.This system also comprises controller, it is for using control module control change device and motor, described control module at least one definite VSR wishing based in chaufeur and vehicle input, determine that the required motor position of adjustment roll wheel location regulates to reach the VSR of hope, required motor position based on determining regulates drive motor, sensing change-speed box output speed when motor is just driven, when motor is just driven, determine actual VSR and provide corresponding to the closed loop feedback of any difference between actual VSR and the VSR of hope drive motor to eliminate the difference between actual VSR and the VSR of hope, by the fast response time of raising and control more accurately, reach thus the VSR of hope.
A kind of vehicle is also provided, and it comprises for controlling the system of continuously variable transmission, and this system response is in chaufeur and vehicle input.
Above-mentioned Characteristics and advantages of the present invention and other Characteristics and advantages will be by reference to the accompanying drawings time, apparent from the following detailed description of the optimal modes more of the present invention for implementing to define as appended claim and other embodiment.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the continuously variable transmission (CVT) with improved control system of the present invention;
Fig. 2 is the partial schematic diagram along the changer of the direction intercepting of the line 2-2 of Fig. 1;
Fig. 3 is the functional block diagram of control module, and described control module is for the controller of improved control system of the present invention; With
Fig. 4 is changer speed ratio (VSR) for using together with the improved control system of the present invention diagram of curves to transmission gear ratio (TSR).
The specific embodiment
With reference to figure 1, show the vehicle 10 that comprises the continuously variable transmission (CVT) 100 with improved control system, described improved control system has changer speed ratio of the present invention (VSR) closed loop feedback.Vehicle 10 comprises driving engine 12, explosive motor for example, and it drives the first connecting device 16, such as power-transfer clutch.The first connecting device 16 drives CVT100(for clear, in longer dotted line, illustrates) input shaft 18.The output shaft 24 of CVT100 is connected to the second connecting device 26, such as diff.The output shaft 28 of the second connecting device 26 can be the axletree for the wheel 30 of propelled vehicles 10.Vehicle 10 also comprises chaufeur input media 32, such as acceleration pedal.The electronic control unit (ECU) that is called as controller 40 in whole description can be positioned on outside CVT100, in order to improved control system of the present invention to be provided.Alternatively, transmission control unit (TCU) (not shown) can be positioned at CVT100 inside, and can comprise for the controller of improved control system of the present invention is provided.
A plurality of sensor localizations, around vehicle 10, are used for sensing and be provided for the signal of improved control system of the present invention.For example, accelerator pedal position sensor 42 can be arranged near chaufeur input media 32, so that driver information signal 43 is provided to controller 40.Vehicle speed sensor 52 can be arranged near wheel 30, for vehicle operating information signal 53 is provided to controller 40.Change-speed box input speed sensor 44 can be arranged near the first connecting device 16, on input shaft 18, so that change-speed box input speed signal 45 is provided to controller 40.Change-speed box output speed sensor 50 can be arranged between CVT100 and the second connecting device 26, on output shaft 24, so that change-speed box output speed signal 51 is provided to controller 40.These two signals 45 and 51 can be combined in controller 40, so that actual transmission gear ratio to be provided.Although shown as discrete line from the described signal of sensor, they can be included on common bus, wirelessly sent, be sent out on multicable of the present invention etc.
Still with reference to figure 1, CVT100(is for clear, in longer dotted line, show) comprise that changer 102(is for clear, be shown as being trapped among compared with in short dash line), described changer comprises at least one input disc 110 and at least one output panel 120, it is connected to input shaft 18 by moment of torsion connecting device 112 respectively, and if needed by moment of torsion connecting device 122 and change-speed box connecting device 124() be connected to output shaft 24.Input disc speed sensor 46 provides input disc speed signal 47 to controller 40, and output panel speed sensor 48 provides output panel speed signal 49 to controller 40.Operatively be positioned between the input disc 110 of changer 102 and output panel 120 is at least one roller 130.Although only shown a representational roller 130, input disc 110 and an output panel 120 in Fig. 1, but the changer 102 that it will be understood by those skilled in the art that CVT100 generally include at least two input discs, two output panels and be arranged in corresponding input disc/output panel between a plurality of rollers.
As illustrated in fig. 1 and 2, the roller 130 of changer 102 is rotatably located with a plurality of angles, to control power from input disc 110 to output panel 120 that transmit from or the amount of moment of torsion.Roller 130 is bond pad 110,120 frictionally, so that power or moment of torsion are delivered to output shaft 24 from input shaft 18.Roller 130 is rotatably supported on lug 132 and bar 134, and described bar 134 has the hydraulic coupling applying by piston 136, roller 130 is remained on to the desired location between input disc 110 and output panel 120.
Refer again to Fig. 1, bar 134 motions are through housing 138, and described housing 138 is around a part for piston 136 and bar 134.Piston 136 and bar 134 are divided into housing 138 cavity of equal areas, comprise the first cavity 140 and the second cavity 150.The first cavity 140 is communicated with first passage 142 fluids, and the second cavity 150 is communicated with second channel 152 fluids.Housing 138 comprises ball check valve (not shown), this boiler check valve allow the first cavity 140 and the second cavity 150 respectively with passage 142,152 between fluid be communicated with (depend in cavity 140,150 which there is higher stress level).Pressure on piston 136 and bar 134 is converted into the rotational force on lug 132, with swing roller 130, changes thus roller 130 positions between input disc 110 and output panel 120.
Hydraulic coupling in the first cavity 140 and the second cavity 150 is set up by rate control valve 160.Rate control valve 160 has a pair of spool 162,164 being connected on spool bars 180, and described spool bars 180 is motion slidably in sleeve 182.Rate control valve 160 is hydraulically connected to pump 170 and two receivers 166,168, two receivers 166,168 are respectively used to, when spool 162 and 164 moves along with motor 178 and lower link 176 move on spool bars 180, the pressure in passage 142 and 152 be changed.Motor 178 can be DC servomotor, any other motor or any actuator, and it does not need to provide precision to control as stepping motor.Owing to comprising the closed loop feedback (seeing Fig. 1 and 3) of the module 350 of improved control system of the present invention, it is unnecessary that this precision is controlled.With reference to figure 1, lower link 176 has the first end 175 of the upper connecting rod 174 of contact and is connected to the second end 177 of motor 178.Pressure sensor 144 and 154 is communicated with in fluid pressure sensing with the hydraulic fluid in passage 142,152 respectively.The cam 172 being formed on bar 134 provides the feedback of the position, angle of roller 130 by upper connecting rod 174.Spool 162,164 is located by the second end 177 of lower link 176 by electrical motor 178.Sleeve 182 and passage 142,152 and fluid reservoir 166 and 168 fluids are communicated with.
Still, with reference to figure 1, controller 40 can comprise digital processing ability, and is suitable for for example, sending control signal based on incoming signal (car speed on vehicle operating information signal 53 and via the engine torque of engine signal 13).Controller 40 can be configured to general purpose digital computer, it generally includes microprocessor or central processing unit, read-only memory (ROM) (ROM), random access storage device (RAM), EEPROM (Electrically Erasable Programmable Read Only Memo) (EPROM), high-frequency clock, analog to digital (A/D) and digital-to-analog (D/A) circuit and I/O (I/O) circuit and device, and the modulation of suitable signal and buffer circuit.Be present in controller 40 or can be by any algorithm and the control system instruction of its access, comprise describedly according to improved CVT control system 300 modules of the present invention (seeing Fig. 1 and 3), can be stored in ROM, and be performed to provide corresponding function.
With reference to figure 1 and 3, show the block diagram of improved CVT control system 300 of the present invention.First control system receives incoming signal 302 in module 310, and described incoming signal 302 comprises driver information, routine as directed accelerator pedal position.Driver information is alternately used the throttle valve position information from driving engine 12 to be acquired via engine signal circuit 13.Incoming signal 302 also can comprise such as information of vehicles such as current car speeds via vehicle operating information signal 53.These signals are imported in controller conventionally, and for example controller 40.Driving engine and information of vehicles (car speed for example changing or the engine torque reducing) are also passed feedback input signal 304 and are input in module 310, as shown in the figure.Based on these inputs, controller 40 is determined the VSR wishing in module 310.In the present invention, the output of module 310 is compared with the output of module 350, and module 350 provides actual VSR in closed loop feedback.This actual VSR can be used the ratio of actual output panel speed signal 49 and actual input disc speed signal 47 to determine by controller 40.Alternatively, actual VSR feedback can be used look-up tables to determine by controller 40, and described look-up table is based on the example curve of changer speed ratio (VSR) to transmission gear ratio (TSR) as shown in Figure 4.Transmission gear ratio can be used change-speed box output speed signal 51 as shown in Figure 1 to determine with the ratio of change-speed box input speed signal 45 by controller 40.
Still, with reference to figure 1 and 3, in module 320, controller 40 uses the VSR of hope and actual VSR and any difference between the VSR of hope to determine that motor position regulates.(in starting procedure, will not have actual VSR, therefore the output of the first module 320 is by the output corresponding to module 310.) required motor position regulates and can use proportional-integral-differential (PID) algorithm that can easily obtain in business software to determine.Other closed loop control algorithms also can be used in scope of the present invention.In module 330, based on this definite motor position, regulate, controller 40 sends motor control signal 41, to regulate drive motor 178 based on this motor position, and makes lower link 176 motions, and spool 162 and 164 is moved as described above.This motion causes that difference of pressure (in cavity 140,150) changes, and causes that actual VSR changes.In module 340, the VSR based on this variation, controller 40 sensings or measurement are with the corresponding actual change-speed box output speed of its variation.Finally, in module 360, improved control system exports to promote vehicle 10 with the change-speed box changing, and sends feedback signal 304, the car speed that described feedback signal 304 comprises variation, the engine torque of variation and other relevant informations as discussed above.Feedback signal 304 is used to determine the VSR of new hope in module 310.In the sampling of recurrence interval, sensed and comprise that the feedback signal 304 of actual vehicle speed is imported in controller 40 as described above in controller 40, and as relatively slow feedback signal, used in module 310.Than waiting for that vehicle operating condition changes to redefine the VSR of the hope to use in the ensuing sampling interval in module 310, use the actual VSR in module 350, closed loop feedback of the present invention provides the fast response time of raising and controls more accurately.
From above-mentioned discussion, it is apparent that, improved control system of the present invention is determined actual VSR continuously and promptly, and it is compared with the VSR wishing, thereby drive motor is to motor adjusting position, to eliminate any difference between actual VSR and the VSR of hope.Thus, improved control system of the present invention has realized with fast response time and the control more accurately improving the VSR wishing.With respect to sending control command to change stepping motor position (it is corresponding to the VSR of hope) and to wait for that before sending to the order that stepping motor is new travel condition of vehicle changes, closed loop feedback of the present invention improves to some extent.Because controller (in stepping motor system) is not known actual VSR, but only according to travel condition of vehicle, regulate the VSR wishing, so need stepping motor to reach position accurately.On the contrary, in improved control system of the present invention, actual VSR is calculated in module 350, and is provided with rapid feedback loop.Therefore, controller 40(is used control module 320,330,340 and 350) directly via DC servomotor torque constant, by adjusting motor position (it regulates changer), control VSR.
With reference to figure 4, it provides changer speed ratio (VSR) for using together with the control system of the present invention exemplary graph to transmission gear ratio (TSR).Use the output of module 340 as above, actual VSR can be read from diagram of curves based on transmission gear ratio in module 350, to provide according to closed loop feedback of the present invention.The VSR of example can from 0.364 to 2.333 scope in, corresponding to from-0.163 to 0(reversing mode) and 0 to 0.654(in forward mode) transmission gear ratio in scope.
Refer again to Fig. 1 and 3, provide by the method for the continuously variable transmission in VSR closed loop quick feedback control vehicle.The method is via incoming signal 302 and feedback signal 304, in response to chaufeur and vehicle input, and comprise control change device 102 and motor 178, described changer 102 comprises at least one roller 130, it is operatively positioned between input disc 110 and output panel 120, thereby changer speed ratio (VSR) is defined as the ratio of output panel speed and input disc speed, and described motor 178 is for regulating the position of roller 130.The method comprises, in module 310, based at least one in chaufeur and vehicle input, via incoming signal 302 and feedback signal 304, determines the VSR wishing.Next the method comprises, in module 320, the position adjustments of the motor 178 that the position of definite adjusting roller 130 is required, to reach the VSR of hope.The method comprises, in module 330, and the required motor position adjustments based on definite, drive motor 178.The method comprises, in module 340, and sensing change-speed box output speed when motor is just driven.The method comprises, in module 350, when motor is just driven, determine actual VSR, and the method is used corresponding to the closed loop feedback of any difference between actual VSR and the VSR of hope and is carried out drive motor, to eliminate this difference, thus by the fast response time improving and the VSR that controls more accurately realization hope.
The detailed description of system and method and figure or accompanying drawing support and description the present invention, but scope of the present invention is only defined by the claims.Although described optimal mode and other embodiment for the invention of execution requirements protection in detail, existed various replacements to relate to and embodiment, for putting into practice the present invention who is limited to claims.

Claims (10)

1. a method of controlling the continuously variable transmission in vehicle, the method is in response to chaufeur and vehicle input, and there is changer and motor, described changer comprises at least one roller, this at least one roller is operatively positioned between input disc and output panel, thereby changer speed ratio (VSR) is defined as the ratio of output panel speed and input disc speed, described motor is for adjustment roll wheel location, and the method comprises:
Based at least one in the input of chaufeur and vehicle, determine the VSR wishing;
Determine and regulate the required motor position in position of roller to regulate, to reach the VSR of hope;
Required motor position adjustments based on definite, drive motor;
When motor is just driven, sensing change-speed box output speed;
When motor is just driven, determine actual VSR; With
Provide the closed loop feedback corresponding to any difference between actual VSR and the VSR of hope, and drive motor is to eliminate the difference between actual VSR and the VSR of hope, reaches thus the VSR of hope.
2. the method for claim 1, wherein motor is DC servomotor.
3. the method for claim 1, wherein usage ratio-integration-differential (PID) algorithm determines that required motor position regulates.
4. the method for claim 1, comprises the feedback signal of using car speed, determines the VSR wishing.
5. the method for claim 1, wherein determine that actual VSR further comprises, sensing output panel speed and input disc speed when motor is just driven, and calculate actual changer speed, the ratio of the output panel speed that the changer speed of described reality is sensing and the input disc speed of sensing.
6. the method for claim 1, further comprises sensing change-speed box input speed, and wherein, actual VSR is used the ratio of the change-speed box output speed of sensing and the change-speed box input speed of sensing to be determined.
7. for controlling the system of the continuously variable transmission of vehicle, this system response is in chaufeur and vehicle input, and this system comprises:
Changer, comprises at least one roller, and this at least one roller is operatively positioned between input disc and output panel, thereby changer speed ratio (VSR) is defined as the ratio of output panel speed and input disc speed;
Motor, for regulating the position of roller; With
Controller, for control change device and electrical motor, its mode be by: based at least one in the input of chaufeur and vehicle, determine the VSR wishing, determine that the required motor position of adjustment roll wheel location regulates to reach the VSR of hope, required motor position based on determining regulates drive motor, sensing change-speed box output speed when electrical motor is just driven, when electrical motor is just driven, determine actual VSR and provide corresponding to the closed loop feedback of any difference between actual VSR and the VSR of hope and drive motor to eliminate the difference between actual VSR and the VSR of hope, reach thus the VSR of hope.
8. system as claimed in claim 7, wherein motor is DC servomotor.
9. system as claimed in claim 7, its middle controller usage ratio-integration-differential (PID) algorithm determines that required motor position regulates.
10. system as claimed in claim 7, its middle controller is further provided for determining the feedback of the car speed of the VSR wishing.
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